Impurity removal device and impurity removal system

Abstract

The embodiment of the utility model discloses an impurity removal device and an impurity removal system. The impurity removal device mainly comprises an outer cylinder and an inner cylinder movably arranged in the outer cylinder, and an overflowing gap used for screening impurities is formed between the outer cylinder and the inner cylinder; a first scraping mechanism is formed between one end of the outer barrel and the outer wall surface of the inner barrel, and an overflow discharging opening is formed in the position, close to the first scraping mechanism, of the outer barrel; a second scraping mechanism is formed between the other end of the inner cylinder and the inner wall surface of the outer cylinder; and when the second scraping mechanism moves towards the first scraping mechanism, the fluid containing impurities in the overflowing gap is extruded to the overflow discharging opening. Compared with the mode that the runner is directly cleaned manually in the traditional technology, the scheme has higher controllability, safety and application expansibility.

Description

Technical Field

[0001] The present application relates to the technical field of impurity removal equipment, and in particular to an impurity removal device and an impurity removal system. Background Art

[0002] With the continuous improvement of lithium battery technology development, the market has put forward higher requirements for all aspects of lithium battery performance, among which the safety performance of lithium batteries is related to the lifeblood of enterprise development. At present, it is known that the active substances in the cells of lithium batteries contain metal impurities such as copper, zinc, and iron, and the presence of these metal impurities will greatly reduce the safety performance of the battery. In response to this, the industry basically sets up an iron remover before coating to remove the corresponding metal impurities.

[0003] However, current iron removers require manual impurity removal operations. The high-intensity production rhythm will lead to a higher frequency of cleaning, a large investment in manpower and a greater impact on work efficiency. In addition, the slurry contains highly corrosive viscous fluids, and the safety of manual cleaning is also low. Utility Model Content

[0004] In view of the above problems, the present application provides an impurity removal device and an impurity removal system, which can facilitate the removal of magnetic impurities in the slurry, and the removal operation of the magnetic impurities can be safer and more convenient.

[0005] In an embodiment of the present application, there is provided an impurity removal device, comprising an outer cylinder and an inner cylinder movably disposed in the outer cylinder, wherein a flow gap for screening impurities is formed between the outer cylinder and the inner cylinder;

[0006] A first scraping mechanism is formed between one end of the outer tube and the outer wall surface of the inner tube, and an overflow outlet is provided on the outer tube near the first scraping mechanism; a second scraping mechanism is formed between the other end of the inner tube and the inner wall surface of the outer tube;

[0007] When the second scraper mechanism moves toward the first scraper mechanism, the impurity-containing fluid in the flow gap is squeezed to the overflow port.

[0008] In the embodiment of the present application, by setting the first scraper mechanism and the second scraper mechanism between the outer cylinder and the inner cylinder, the relative movement between the outer cylinder and the inner cylinder can be controlled so that the first scraper mechanism and the second scraper mechanism move toward each other, thereby squeezing the fluid containing impurities in the flow gap to the overflow port for discharge. Compared with the traditional method of manually cleaning the flow channel, the relative movement between the outer cylinder and the inner cylinder in the present application has higher controllability, can avoid direct contact between the operator and the fluid, and has better safety; and it is easy to use with automated equipment, easy to use, and has higher application scalability.

[0009] In some embodiments, the inner wall surface of the outer cylinder and / or the outer wall surface of the inner cylinder is an adsorption action surface.

[0010] In the embodiment scheme of the present application, by setting the inner wall surface of the outer cylinder and / or the outer wall surface of the inner cylinder as an adsorption action surface, the corresponding impurities in the fluid passing through the flow gap can be adsorbed through the adsorption effect, thereby realizing the screening of impurities.

[0011] In some embodiments, the inner cylinder includes a middle cylinder body, and a magnetic generator is disposed in the middle cylinder body.

[0012] In the embodiment of the present application, by setting up the magnetic generator, the effect of the magnetic field can be used to adsorb magnetic impurities in the passing fluid, thereby facilitating subsequent impurity removal operations.

[0013] In some embodiments, the magnetic force generator includes a plurality of electromagnetic coils;

[0014] Alternatively, the magnetic force generator includes a plurality of magnets arranged in a stacked manner.

[0015] In the embodiment of the present application, the magnetic force generator can be configured in the form of an electromagnetic coil or in the form of a plurality of magnets, thereby forming a magnetic field to adsorb magnetic impurities.

[0016] In some embodiments, the inner cylinder includes an upper cylinder, and a fluid outlet is disposed in the upper cylinder;

[0017] The upper cylinder is connected to the middle cylinder and communicates with the flow gap.

[0018] In the embodiment of the present application, the upper cylinder is provided to facilitate the provision of the fluid outlet; and the fluid output is facilitated by the connection between the fluid outlet and the flow gap.

[0019] In some embodiments, the inner cylinder includes a lower cylinder body, and a fluid inlet is disposed in the lower cylinder body;

[0020] The lower cylinder is connected to the middle cylinder and communicates with the flow gap.

[0021] In the embodiment of the present application, the lower cylinder body is provided to facilitate the provision of the fluid inlet; and the fluid input is facilitated by the communication between the fluid inlet and the flow gap.

[0022] In some embodiments, a one-way valve is disposed in the lower cylinder.

[0023] In the embodiment of the present application, the one-way valve is provided to avoid the phenomenon of fluid backflow, thereby facilitating the removal of impurities.

[0024] In some embodiments, the first scraper mechanism includes a plurality of first scraper rings, the plurality of first scraper rings are embedded in the outer tube, and the inner wall surface of the first scraper ring is in contact with the outer wall surface of the inner tube;

[0025] And / or, the second scraper mechanism includes a plurality of second scraper rings, the plurality of second scraper rings are embedded in the inner tube, and the outer wall surfaces of the second scraper rings are in abutment contact with the inner wall surface of the outer tube.

[0026] In the embodiment scheme of the present application, through the contact between the first scraper ring and the outer wall surface of the inner cylinder, and the contact between the second scraper ring and the inner wall surface of the outer cylinder, when relative movement occurs between the outer cylinder and the inner cylinder, the fluid on the wall surface can be scraped off, and the scraped fluid can be squeezed to the overflow port for discharge.

[0027] In addition, an embodiment of the present application also provides a de-impurity system, on which at least one de-impurity device as described above is provided.

[0028] In the embodiment of the present application, by applying the impurity removal device provided in the embodiment of the present application in the impurity removal system, the impurity removal efficiency of the impurity removal system can be improved, and the impurity removal operation can be simpler and safer.

[0029] In some embodiments, a plurality of said impurity removal devices are included;

[0030] Several of the impurity removal devices are arranged in series; and / or several of the impurity removal devices are arranged in parallel.

[0031] In the embodiment of the present application, the number of the impurity removal devices can be designed according to actual application requirements to improve the application effect of the impurity removal system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0033] Figure 1 Schematic diagram of the internal structure of the impurity removal device of some embodiments of the present application.

[0034] Figure 2 This is a schematic diagram of the installation of the first scraper mechanism in some embodiments of the present application.

[0035] Figure 3 This is a schematic diagram of the installation of the second scraper mechanism in some embodiments of the present application.

[0036] Figure 4 Schematic diagram of the impurity removal action of the impurity removal device in some embodiments of the present application.

[0037] Figure 5 It is a schematic diagram of the partial structure of the impurity removal device of some embodiments of the present application.

[0038] Figure 6 It is a schematic diagram of the three-dimensional structure of the impurity removal device of some embodiments of the present application.

[0039] Some of the reference numerals in the specific implementation manner are as follows:

[0040] 1-outer cylinder, 11-first scraper mechanism, 111-first scraper ring, 12-overflow outlet, 13-bushing, 131-first inner groove;

[0041] 2-inner cylinder, 21-second scraping mechanism, 211-second scraping ring, 22-middle cylinder, 23-magnetic generator, 231-magnet, 24-upper cylinder, 241-fluid outlet, 25-lower cylinder, 251-fluid inlet, 252-pressing plate, 253-second inner groove, 26-gravity ball;

[0042] 3-current clearance, 31-reserved clearance. DETAILED DESCRIPTION

[0043] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0045] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0046] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] At present, in the process of preparing battery slurry, it is necessary to remove metal impurities such as copper, zinc, and iron in the slurry, especially the removal of metal iron impurities. In traditional technology, a magnetic rod device for impurity removal is usually provided, a flow channel is provided in the magnetic rod device for conveying slurry fluid, and then a magnet is provided on the periphery of the flow channel to adsorb and concentrate the magnetic impurities through the action of the magnetic field for easy cleaning.

[0051] However, in this application form, it is often necessary to manually clean the fluid and impurities in the flow channel, which is troublesome; and the slurry contains highly corrosive substances, which will harm the health of the operators. Furthermore, with the continuous increase in production capacity, the frequency of cleaning is also increasing, so the labor cost is also increasing, and the high-frequency impurity removal operation is likely to reduce production efficiency.

[0052] In view of the above technical problems, the present embodiment mainly provides an impurity removal device and an impurity removal system, which can facilitate the removal of magnetic impurities in the slurry, and the removal operation of the magnetic impurities can be safer and more convenient.

[0053] like Figure 1-6 As shown in , a de-impurity device provided according to some embodiments of the present application includes an outer cylinder 1 and an inner cylinder 2, and a flow gap 3 is formed between the outer cylinder 1 and the inner cylinder 2, and the flow gap 3 can be used to screen impurities.

[0054] In some embodiments, Figure 1 , 4 As shown, a top opening is provided on the outer cylinder 1, and the inner cylinder 2 extends from the top opening of the outer cylinder 1 and is provided in the outer cylinder 1, and the inner cylinder 2 can slide relative to the outer cylinder 1, so that the inner cylinder 2 is movably provided in the outer cylinder 1.

[0055] In some embodiments, Figure 2 As shown, a first scraper mechanism 11 is formed between the top opening of the outer tube 1 and the outer wall surface of the inner tube 2. The first scraper mechanism 11 can be used to scrape off the fluid attached to the outer wall surface of the inner tube 2.

[0056] In some embodiments, Figure 3 As shown, the inner tube 2 is provided with a second scraper mechanism 21 between its bottom end and the inner wall surface of the outer tube 1 , and the fluid attached to the inner wall surface of the outer tube 1 can be scraped off by the second scraper mechanism 21 .

[0057] In some embodiments, an overflow port 12 is provided on the side wall of the outer tube 1 , the overflow port 12 is provided close to the first scraper mechanism 11 , and the overflow port 12 is communicated with the flow gap 3 .

[0058] During normal operation, the inner cylinder 2 extends into the outer cylinder 1 to form the flow gap 3. At this time, the first scraper mechanism 11 and the second scraper mechanism 21 are respectively located at the two ends of the formed flow gap 3, and the slurry and other fluids pass through the flow gap 3, and the corresponding impurities in the slurry are screened through the flow gap 3.

[0059] When it is necessary to clean the impurities after screening, the inner cylinder 2 can be driven to move relative to the outer cylinder 1. At this time, the second scraper mechanism 21 moves toward the first scraper mechanism 11 along with the movement of the inner cylinder 2, and scrapes the inner wall surface of the outer cylinder 1, while the first scraper mechanism 11 scrapes the outer wall surface of the inner cylinder 2. As the first scraper mechanism 11 and the second scraper mechanism 21 get closer, the space of the flow gap 3 will shrink, and the scraped slurry and other fluids will be squeezed, so that the slurry containing the impurities screened can be discharged from the overflow port 12.

[0060] After the impurities are discharged, the inner cylinder 2 can be reset to form an application cycle.

[0061] By arranging the first scraper mechanism 11 and the second scraper mechanism 21 between the outer cylinder 1 and the inner cylinder 2, the relative movement between the outer cylinder 1 and the inner cylinder 2 can be controlled so that the first scraper mechanism 11 and the second scraper mechanism 21 move toward each other, thereby squeezing the fluid containing impurities in the flow gap 3 to the overflow port 12 and discharging it.

[0062] Compared with the traditional technology of directly cleaning the flow channel manually, the relative movement between the outer cylinder 1 and the inner cylinder 2 in the present embodiment has higher controllability, and the operator can avoid direct contact with the fluid during the entire impurity discharge operation, which is safer; by controlling the inner cylinder 2 to enter and exit the outer cylinder 1, the impurity removal operation can be performed, which is convenient and more efficient; moreover, automated equipment can be provided for use with the inner cylinder 2 and / or the outer cylinder 1, for example, by using automated equipment such as a telescopic cylinder, the relative movement between the outer cylinder 1 and the inner cylinder 2 can be controlled, thereby facilitating the realization of automated impurity removal operations, so that the entire device can have higher application scalability and improve application benefits.

[0063] As one application example, the inner wall surface of the outer tube 1 and / or the outer wall surface of the inner tube 2 is set as an adsorption action surface.

[0064] By setting the inner wall surface of the outer cylinder 1 and / or the outer wall surface of the inner cylinder 2 as an adsorption action surface, the corresponding impurities in the fluid passing through the flow gap 3 can be adsorbed through the adsorption effect, thereby realizing the screening of impurities, and the screened impurities can be adsorbed in the flow gap 3.

[0065] As one application example, the inner cylinder 2 is provided with a middle cylinder body 22 , and a magnetic force generator 23 is provided inside the middle cylinder body 22 .

[0066] In some embodiments, a corresponding magnetic generator may also be disposed in the middle of the outer tube 1 .

[0067] By setting the magnetic generator 23, the effect of the magnetic field can be utilized to adsorb the magnetic impurities in the passing fluid, thereby facilitating the subsequent impurity removal operation.

[0068] In some embodiments, the magnetic force generator 23 can be configured as an electromagnetic coil. For example, the coil is wound inside the middle cylinder 22, and the wire is led out from the top of the inner cylinder 2, and a magnetic field is formed through conductive connection, and then the corresponding impurities in the fluid are adsorbed; or the coil is wound on the outer cylinder 1, and a magnetic field can also be formed through conductive connection, and then the corresponding impurities in the fluid are adsorbed.

[0069] In some embodiments, Figure 1 , 4 As shown, the magnetic force generator 23 can also be set in the form of an application of a magnet 231. For example, a plurality of the magnets 231 are arranged according to a preset rule to form a magnetic field; in this case, the magnet 231 can be set in the middle cylinder 22, such as a circular magnet, or can be set on the outer cylinder 1, such as a ring-shaped magnet.

[0070] In some embodiments, the preset rule is mainly based on the magnetization effect between the magnets 231. For example, multiple magnets 231 are stacked and the ends of two magnets 231 close to each other have the same magnetic properties, thereby enhancing the magnetic field effect.

[0071] By providing the electromagnetic coil or the magnet 231, a magnetic field can be formed on the inner cylinder 2 and / or the outer cylinder 1, so that the corresponding impurities in the fluid are adsorbed by the formed magnetic field to achieve an impurity removal effect.

[0072] As an example of one application, Figure 2 As shown, the inner cylinder 2 is further provided with an upper cylinder body 24 , and a fluid outlet 241 is provided in the upper cylinder body 24 , and the fluid outlet 241 is communicated with the flow gap 3 .

[0073] In some embodiments, the outer diameter width between the upper cylinder 24 and the middle cylinder 22 is set to be consistent; in normal use, the first scraper mechanism 11 is set between the outer cylinder 1 and the upper cylinder 24.

[0074] In some embodiments, a reserved gap 31 exists between the upper cylinder 24 and the middle cylinder 22 , and the fluid outlet 241 is connected to the flow gap 3 through the reserved gap 31 .

[0075] In some embodiments, the upper cylinder 24 and the middle cylinder 22 can be set to a detachable installation connection mode. In this case, the structural design of the upper cylinder 24 and the middle cylinder 22 can be simpler, and the application and maintenance can be more convenient.

[0076] The upper cylinder 24 can facilitate the arrangement of the fluid outlet 241 ; and the fluid outlet 241 can be connected to the flow gap 3 to facilitate the output of fluids such as slurry.

[0077] As an example of one application, Figure 3 As shown, the inner cylinder 2 is further provided with a lower cylinder body 25 , and a fluid inlet 251 is provided in the lower cylinder body 25 , and the fluid inlet 251 is communicated with the flow gap 3 .

[0078] In some embodiments, the outer diameter width of the lower cylinder 25 is configured to match the inner diameter width of the outer cylinder 1 , and the second scraper mechanism 21 is disposed between the lower cylinder 25 and the outer cylinder 1 .

[0079] In some embodiments, there is also a reserved gap 31 between the middle cylinder 22 and the lower cylinder 25 , and the fluid inlet 251 and the flow gap 3 are connected through the reserved gap 31 .

[0080] In some embodiments, the lower cylinder 25 and the middle cylinder 22 may also be provided with a detachable installation connection mode, in which case the structural design of the lower cylinder 25 and the middle cylinder 22 may be simpler, and the application and maintenance may be more convenient.

[0081] By setting the lower cylinder 25, it is convenient to set the fluid inlet 251; and by the communication between the fluid inlet 251 and the flow gap 3, it is convenient to input fluid such as slurry, thereby forming a flow channel.

[0082] As an application example, a one-way valve is provided in the lower cylinder 25 .

[0083] In some embodiments, Figure 3 As shown, the one-way valve includes a gravity ball 26, and the gravity ball 26 is arranged in the fluid inlet. When the slurry enters, the gravity ball 26 is lifted by the input pressure of the slurry, and then passes through the flow gap 3 and is output from the fluid outlet 241; during the impurity removal operation, the first scraper mechanism 11 and the second scraper mechanism 21 form an extrusion on the flow gap 3, at which time the gravity ball 26 falls and blocks the fluid inlet 251.

[0084] By setting the one-way valve, the phenomenon of fluid backflow can be avoided, thereby facilitating the impurity removal operation, and the structure is simple and easy to use.

[0085] As an example of one application, Figure 2 As shown, the first scraper mechanism 11 includes a plurality of first scraper rings 111 , which are embedded in the outer tube 1 , and the inner wall surface of the first scraper ring 111 is in contact with the outer wall surface of the inner tube 2 .

[0086] In some embodiments, a detachable bushing 13 is provided at the top opening of the outer cylinder 1. After the bushing 13 is installed at the top opening of the outer cylinder 1, a first inner groove 131 can be formed between the bushing 13 and the outer cylinder 1; the first scraper ring 111 is embedded in the first inner groove 131 and is tightened by the bushing 13.

[0087] As an example of one application, Figure 3 As shown, the second scraper mechanism 21 includes a plurality of second scraper rings 211 , which are embedded in the lower cylinder 25 , and the outer wall surface of the second scraper ring 211 is in contact with the inner wall surface of the outer cylinder 1 .

[0088] In some embodiments, a detachable pressure plate 252 is provided on the lower cylinder 25. After the pressure plate 252 is installed on the lower cylinder 25, it can form a second inner groove 253 with the lower cylinder 25; the second scraper ring 211 is embedded in the second inner groove 253 and is tightened by the pressure plate 252.

[0089] In some embodiments, the first scraper ring 111 and / or the second scraper ring 211 may be made of a colloid material.

[0090] In some embodiments, the number of the first scraper ring 111 and the second scraper ring 211 can be multiple.

[0091] Through the contact between the first scraper ring 111 and the outer wall surface of the inner tube 2, and the contact between the second scraper ring 211 and the inner wall surface of the outer tube 1, when relative movement occurs between the outer tube 1 and the inner tube 2, the fluid on their respective wall surfaces can be scraped off, and the scraped fluid can be squeezed to the overflow port 12 for discharge.

[0092] In addition, this embodiment also provides an impurity removal system, which can be applied to the production of battery slurry; wherein the impurity removal system is provided with at least one impurity removal device as described above.

[0093] By applying the impurity removal device provided in the embodiment in the impurity removal system, the machine downtime caused by the impurity removal operation can be effectively reduced during the impurity removal operation, thereby facilitating the improvement of the impurity removal efficiency of the impurity removal system while taking into account the production efficiency; moreover, the impurity removal operation can also be carried out more simply and safely.

[0094] As one application example, the number of the impurity removal devices can be designed according to actual application requirements to improve the application effect of the impurity removal system; in this case, the number of the impurity removal devices can be multiple.

[0095] In some embodiments, a plurality of the impurity removal devices may be sequentially arranged along the slurry conveying channel so that the plurality of the impurity removal devices are arranged in series; in this case, it is convenient to perform a hierarchical impurity removal operation on the slurry, thereby improving the quality of the slurry finally obtained.

[0096] In some embodiments, multiple impurity removal devices may be arranged side by side so that the multiple impurity removal devices are arranged in parallel. In this case, it is convenient to perform convergent impurity adsorption operations on multiple slurry conveying channels, and when performing impurity removal operations, the movement of the outer cylinder 1 and / or the inner cylinder 2 of the multiple impurity removal devices can be controlled by a lifting action, and the impurity removal efficiency will be higher.

[0097] In some embodiments, the series and parallel configurations of the impurity removal devices can be used in combination according to actual application requirements.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A de-impurity device, characterized in that: It comprises an outer cylinder and an inner cylinder movably arranged in the outer cylinder, and a flow gap for screening impurities is formed between the outer cylinder and the inner cylinder; A first scraping mechanism is formed between one end of the outer tube and the outer wall surface of the inner tube, and an overflow outlet is provided on the outer tube near the first scraping mechanism; a second scraping mechanism is formed between the other end of the inner tube and the inner wall surface of the outer tube; When the second scraper mechanism moves toward the first scraper mechanism, the impurity-containing fluid in the flow gap is squeezed to the overflow port.

2. The impurity removal device according to claim 1, characterized in that: The inner wall surface of the outer tube and / or the outer wall surface of the inner tube are adsorption action surfaces.

3. The impurity removal device according to claim 1, characterized in that: The inner cylinder comprises a middle cylinder body, and a magnetic force generator is arranged in the middle cylinder body.

4. The impurity removal device according to claim 3, characterized in that: The magnetic force generator includes a plurality of electromagnetic coils; Alternatively, the magnetic force generator includes a plurality of magnets arranged in a stacked manner.

5. The impurity removal device according to claim 3 or 4, characterized in that: The inner cylinder comprises an upper cylinder body, and a fluid outlet is arranged in the upper cylinder body; The upper cylinder is connected to the middle cylinder and communicates with the flow gap.

6. The impurity removal device according to claim 5, characterized in that: The inner cylinder comprises a lower cylinder body, and a fluid inlet is arranged in the lower cylinder body; The lower cylinder is connected to the middle cylinder and communicates with the flow gap.

7. The impurity removal device according to claim 6, characterized in that: A one-way valve is arranged in the lower cylinder.

8. The impurity removal device according to claim 1 or 7, characterized in that: The first scraping mechanism comprises a plurality of first scraping rings, the plurality of first scraping rings are embedded in the outer tube, and the inner wall surface of the first scraping ring is in contact with the outer wall surface of the inner tube; And / or, the second scraper mechanism includes a plurality of second scraper rings, the plurality of second scraper rings are embedded in the inner tube, and the outer wall surfaces of the second scraper rings are in abutment contact with the inner wall surface of the outer tube.

9. A system for removing impurities, characterized in that: The impurity removal system is provided with at least one impurity removal device as described in any one of claims 1 to 8.

10. The impurity removal system according to claim 9, characterized in that: It includes several impurity removal devices; Several of the impurity removal devices are arranged in series; and / or several of the impurity removal devices are arranged in parallel.

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